This paper deals with the performance improvement of synchronous generator Type 4 driven by the wind turbine at high wind speed operation in a microgrid connected to a weak utility grid. The importance of applying the pitch angle control loop at high wind speeds in wind turbine generators is undeniable to prevent overloading and other destructive effects on the generator parameters caused by the wind speed increase. Thus, a robust control scheme in the pitch angle loop would certainly improve the performance of the wind turbine generator. In this study, the principle of the proposed method is based on the design and applying the different fractional order controllers including the Fractional Order Proportional Integral (FOPI) and FO[PI] types in the pitch compensation loop, instead of the conventional Proportional Integral (PI) controller to extract the proper values for the pitch angle reference profile. An analytical method is extended to the pitch servo control for designing the PI and fraction order PI controllers to ensure the frequency domain specifications. To verify the efficacy of the FOPI and FO[PI] controllers in comparison with the PI one, various simulation results in the high wind speed operation mode of 18 m/s considering 10% turbulence intensity are obtained using MATLAB/SIMULINK software. The performance enhancement is surveyed by monitoring the generator parameters including the mechanical torque, the active/reactive power, and the DC link voltage profiles. The results validated the effectiveness of the proposed controllers.